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现代隧道技术 2022, Vol. 59 Issue (5) :125-135    DOI:
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超大截面顶升立管受力特性研究
 
(1.山东电力工程咨询院有限公司,济南 250013;2. 同济大学 地下建筑与工程系,上海 200092)
Study on Mechanical Characteristics of Super Large Section Riser Pipe by Vertical Jacking Method
 
(1. Shandong Electric Power Engineering Consulting Institute Co. Ltd., Jinan 250013;2. Department of Geotechnical Engineering,Tongji University, Shanghai 200092)
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摘要 垂直顶升工法施工过程中,结构安全性的一个重要控制因素为垂直工法的开口大小。开口立管的半径与原隧道的半径比越大,开口后对结构的安全性影响越大。以某取排水工程采取的超大截面顶升立管开口施工过程为背景,将动态施工过程转化为模拟工况,通过数值模拟,研究超大截面顶升立管的结构受力特性。结果表明:(1)施工过程中结构可能产生的两种变形趋势,其一为顶升工况下结构的整体下沉趋势,其二为开孔工况下开孔环的竖鸭蛋变形趋势;(2)顶升工况下开孔环底部轴力大幅减小。最大拉力达到400 kN,开孔环的变化趋势大于闭孔环。未通水工况与满水工况的内力情况类似于初始工况;(3)环缝剪切以开孔环与闭孔环环间为主。顶升工况下最大径向剪切力达到30 kN/m,开孔工况下环间径向剪切力达到60 kN/m;(4)施工过程中开孔工况为该施工过程的控制工况;(5)顶升工况和开孔工况下应对环缝进行验算设计。
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韩 超 1 高一民 2 周广杰1 张 磊 1 柳 献 2
关键词垂直顶升工法   超大截面   模拟工况   受力特性     
Abstract: In the construction process of the vertical jacking method, an important control factor for the structural safety is the opening size of the vertical method. The larger the ratio of the radius on the open riser compared to the original tunnel, the greater impact on the safety of the structure would happen after the opening. According to the background of the construction process of the super large section jacking riser opening in a water intake and drainage project, the dynamic construction process is transformed into a simulated working condition, and the structural stress characteristics of the super large section jacking riser are summarized by numerical simulation method. The research results show that: (1) There are two possible deformation trends of the structure during the construction process, one is the overall sinking trend of the structure under the jacking condition, and the other is the vertical duck egg deformation trend of the opening ring under the opening condition; (2) The axial force at the bottom of the opening ring is greatly reduced under the jacking condition. The maximum tensile force is 400 kN and the change trend of the open ring is greater than that of the closed ring. The internal force conditions of the unfilled and full water conditions are similar to the initial conditions; (3) The shear of the joint is mainly between the open ring and the closed ring. The maximum radial shear force reaches 30 kN/m under the jacking condition, and the inter-ring radial shear force reaches 60 kN/m under the opening condition; (4) The opening condition during the construction is the control condition; (5) Under the jacking condition and the opening condition, the checking design of the annular joint shall be carried out.
KeywordsVertical jacking method,   Super large section,   Simulated working condition,   Stress characteristics     
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作者简介: 韩 超(1983-),男,硕士,高级工程师,从事电力工程水工结构方面的工作和研究,E-mail: hanchao@sdepci.com. 通讯作者:柳 献(1977),男,教授,博士,从事隧道与地下建筑结构研究,E?mail:xian.liu@tongji.edu.cn.
引用本文:   
韩 超 1 高一民 2 周广杰1 张 磊 1 柳 献 2 .超大截面顶升立管受力特性研究[J]  现代隧道技术, 2022,V59(5): 125-135
HAN Chao1 GAO Yimin2 ZHOU Guangjie1 ZHANG Lei1 LIU Xian2 .Study on Mechanical Characteristics of Super Large Section Riser Pipe by Vertical Jacking Method[J]  MODERN TUNNELLING TECHNOLOGY, 2022,V59(5): 125-135
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